A concrete crack repair additive and its preparation and use method

A technology of concrete and additives, which is applied in building maintenance, construction, building construction, etc., can solve problems such as poor strength and poor durability, and achieve good durability, good flexural strength, and excellent comprehensive performance.

Active Publication Date: 2022-04-15
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a silicone resin emulsion-modified high molecular polymer crack repairing additive for the problems of poor strength and poor durability existing in the existing concrete repairing materials. The repairing additive has good fluidity and cohesiveness; the additive can be mixed with cement, filler and sand to effectively penetrate into the fine cracks of concrete and improve the strength and durability of structural concrete

Method used

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  • A concrete crack repair additive and its preparation and use method
  • A concrete crack repair additive and its preparation and use method
  • A concrete crack repair additive and its preparation and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] According to the weight ratio of each component in Table 1, each raw material was weighed. Put each raw material into the mixer, stir at a low speed first, and preliminarily mix each component, the stirring speed is 500 rpm, and the stirring time is 3 minutes; let it stand for 40 seconds, and then stir at a high speed, the stirring speed is 2500 rpm, and the stirring time is 5 minutes. Get repair mortar material. The test results are shown in Table 1.

[0064] Among them, the silicone resin emulsion is Dow Corning 6683 silicone resin emulsion (the main components are organosilane and silicate); the water reducer is polyhydroxy acid water reducer; the defoamer is polyether defoamer; The agent is propylene glycol butyl ether. The cement adopts 42.5 type ordinary Portland cement; the admixture is fly ash; the sand is medium sand with a fineness modulus of 2.2.

Embodiment 2

[0066] According to the weight ratio of each component in Table 1, each raw material was weighed. The preparation method is the same as in Example 1. Put each raw material into the mixer, stir at a low speed first, and preliminarily mix each component, the stirring speed is 400 rpm, and the stirring time is 3 minutes; let it stand for 30 seconds, and then stir at a high speed, the stirring speed is 2000 rpm, and the stirring time is 4 minutes. Get repair mortar material. The test results are shown in Table 1.

[0067] Among them, the silicone resin emulsion is SH9608 silicone resin emulsion (the main component is organosiloxane) of New Sihai Company; the water reducer is polyhydroxyacid water reducer; the defoamer is polyether defoamer; For ethylene glycol monopropyl ether. The cement is Portland cement of type 42.5; the admixture is granulated blast furnace slag powder; the sand is medium sand with a fineness modulus of 2.2.

Embodiment 3

[0069] According to the weight ratio of each component in Table 1, each raw material was weighed. The preparation method is the same as in Example 1. Put each raw material into the mixer, stir at a low speed first, and preliminarily mix each component, the stirring speed is 600 rpm, and the stirring time is 2 minutes; let it stand for 20 seconds, and then stir at a high speed, the stirring speed is 1500 rpm, and the stirring time is 5 minutes. Get repair mortar material. The test results are shown in Table 1.

[0070] The silicone resin emulsion is Dow Corning 6683 silicone resin emulsion; the water reducer is a naphthalene water reducer; the defoamer is a polyether defoamer; and the film forming agent is propylene glycol methyl ether acetate. Ordinary Portland cement is used for cement; silica fume is used as admixture; medium sand with fineness modulus 2.1 is used for sand.

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Abstract

The invention relates to a concrete crack repair additive, in particular to a polymer crack repair additive modified by silicone resin emulsion and its preparation and use method. The restoration additive per 100 parts by weight contains 2-20 parts by weight of silicone resin emulsion, 2-6 parts by weight of film-forming aid, 1-7 parts by weight of water reducing agent and 0.2-1 part by weight of defoamer , the balance is water; the solid content of the silicone resin emulsion is 45% to 55%; the film-forming agent is at least one of propylene glycol butyl ether, ethylene glycol monopropyl ether, and propylene glycol methyl ether acetate. Through silicone resin emulsion, water reducer, defoamer, and controlled within the above range, the strength, coalescence, film-forming performance and stability of silicone resin emulsion are fully exerted, and the cement mortar prepared with this repair additive has With good strength performance and durability, it is suitable for the repair of 0.3-2.5mm concrete micro cracks.

Description

technical field [0001] The invention relates to a concrete crack repair additive, in particular to a high molecular polymer crack repair additive modified by silicone resin emulsion, and its preparation and use method. Background technique [0002] The presence of cracks on the concrete surface is a serious disaster that affects the durability of concrete structures. Under the combined action of a series of internal and external factors such as water loss, uneven soil quality of the structural foundation, and hydration temperature rise, various degrees of plastic shrinkage cracks, settlement shrinkage cracks, and temperature cracks can occur in concrete. Because the concrete structure is exposed to the natural environment all the year round, under the action of temperature stress and external force, the micro cracks on the surface tend to develop into through cracks and deep cracks. Penetrating cracks and deep cracks will seriously affect the integrity of the concrete struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B28/00C04B28/04C04B28/06E04G23/02C04B111/20C04B111/22
CPCE04G23/0203C04B28/04C04B28/00C04B28/06C04B40/0039C04B2201/50C04B2111/20C04B2111/22C04B24/42C04B22/08C04B2103/302C04B2103/50C04B24/023C04B22/002C04B14/06C04B18/08C04B18/141C04B24/045C04B18/146
Inventor 王佩勋何开伟王林李超舒春雪
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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